Context-based smartphone sensor logic

ABSTRACT

Methods employ sensors in portable devices (e.g., smartphones) both to sense content information (e.g., audio and imagery) and context information. Device processing is desirably dependent on both. For example, some embodiments activate certain processor intensive operations (e.g., content recognition) based on classification of sensed content and context. The context can control the location where information produced from such operations is stored, or control an alert signal indicating, e.g., that sensed speech is being transcribed. Some arrangements post sensor data collected by one device to a cloud repository, for access and processing by other devices. Multiple devices can collaborate in collecting and processing data, to exploit advantages each may have (e.g., in location, processing ability, social network resources, etc.). A great many other features and arrangements are also detailed.

RELATED APPLICATION DATA

This application is a continuation of application Ser. No. 15/711,357,filed Sep. 21, 2017 (now U.S. Pat. No. 10,199,042), which is acontinuation of application Ser. No. 15/446,837, filed Mar. 1, 2017 (nowabandoned), which is a continuation of application Ser. No. 14/947,008,filed Nov. 20, 2015 (now U.S. Pat. No. 9,595,258), which is a divisionalof application Ser. No. 13/607,095, filed Sep. 7, 2012 (now U.S. Pat.No. 9,196,028), which is a non provisional of applications 61/542,737,filed Oct. 3, 2011, and 61/538,578, filed Sep. 23, 2011. applicationSer. No. 15/711,357 is also a continuation in part of application Ser.No. 15/139,671, filed Apr. 26, 2016 (now U.S. Pat. No. 9,830,950), whichis a continuation of application Ser. No. 14/157,108, filed Jan. 16,2014 (now U.S. Pat. No. 9,330,427), which is a divisional of applicationSer. No. 13/299,140, filed Nov. 17, 2011 (now U.S. Pat. No. 8,819,172),which is a continuation in part of application PCT/US11/59412, filedNov. 4, 2011 (now published as WO2012061760). Application PCT/US11/59412is a continuation of each of application Ser. No. 13/278,949, filed Oct.21, 2011 (now U.S. Pat. No. 9,183,580); Ser. No. 13/207,841, filed Aug.11, 2011 (now U.S. Pat. No. 9,218,530); and Ser. No. 13/174,258, filedJun. 30, 2011 (now U.S. Pat. No. 8,831,279). Application PCT/US11/59412is also a non provisional of applications 61/501,602, filed Jun. 27,2011; 61/485,888, filed May 13, 2011; 61/483,555, filed May 6, 2011;61/479,323, filed Apr. 26, 2011; and 61/471,651, filed Apr. 4, 2011.

BACKGROUND AND SUMMARY

In published applications 20110212717, 20110161076 and 20120208592, thepresent assignee detailed a variety of smartphone arrangements thatrespond in accordance with context. The present specification expandsthese teachings in certain respects.

In accordance with one aspect, systems and methods according to thepresent technology use a smartphone to sense audio and/or visualinformation, and provide same to a first classifier module. The firstclassifier module characterizes the input audio-visual stimuli by type(e.g., music, speech, silence, video imagery, natural scene, face,etc.). A second classifier module processes other context information(which may include the output from the first classifier module), such asof day, day of week, location, calendar data, clock alarm status, motionsensors, Facebook status, etc., and outputs data characterizing a devicestate type, or scenario. A control rule module then issues controlsignals to one or more content recognition modules in accordance withthe outputs from the two classifier modules.

The control signals can simply enable or disable the differentrecognition modules. Additionally, if a recognition module is enabled,the control signals can establish the frequency, or schedule, or otherparameter(s), by which the module performs its recognition functions.

Such arrangements conserve battery power, by not attempting operationsthat are unneeded or inappropriate to the context. Moreover, they aidother smartphone operations, since processing resources are not divertedto the idle recognition operations.

The foregoing and other features and advantages of the presenttechnology will be more readily apparent from the following detaileddescription, which proceeds with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an illustrative embodiment that incorporates certainaspects of the present technology.

FIG. 2 shows a few of the content recognition modules that may be usedin the FIG. 1 embodiment.

FIG. 3 is a block diagram of a process employing aspects of the presenttechnology.

FIG. 4 is a block diagram of an apparatus employing aspects of thepresent technology.

FIG. 5 is an event controller table illustrating, for one embodiment,how different audio recognition agents are activated based on audioclassification data.

FIG. 6 is a flow chart illustrating, for one embodiment, how differentaudio recognition agents are activated based on audio classificationdata.

FIG. 7 is an event controller table illustrating, for one embodiment,how different image recognition agents are activated based on outputsfrom light and motion sensors, and image classification data.

FIG. 8 is a flow chart illustrating, for one embodiment, how differentimage recognition agents are activated based on outputs from light andmotion sensors, and image classification data.

DETAILED DESCRIPTION

Referring to FIG. 1, an illustrative embodiment 10 that incorporatescertain aspects of the present technology includes one or moremicrophones 12, cameras 14, audio-visual classifier modules 16, secondclassifier modules 18, control rule modules 20, and content recognitionmodules 22. These components may all be included in a smartphone.Alternatively, they may be distributed between different locationsand/or different devices (including the cloud).

One suitable smartphone is the Apple iPhone 4 device, which includes twocameras (one front-facing and one rear-facing), and two microphones.Another is the HTC EVO 3D, which includes stereo cameras (bothrear-facing).

The audio-visual classifier module(s) 16 processes the data captured bythe microphone(s) and/or camera(s), and classifies such audio-visualcontent by type.

As is familiar to artisans (and as explained in the Wikipedia article“Statistical classification”), classification is the problem ofidentifying to which of a set of categories (sub-populations) a newobservation belongs. The individual observations may be analyzed into aset of quantifiable properties, known variously as variables, features,etc. These properties may be categorical (e.g. “A”, “B”, “AB” or “O”,for blood type), ordinal (e.g. “large”, “medium” or “small”), etc. Afamiliar (although sometimes difficult) classification problem isidentifying email as spam or not-spam. An algorithm or procedure thatimplements classification is known as a classifier.

Classically, classification is performed based on a training set of datacomprising observations (or instances) whose category membership isknown. Classification, in this sense, is regarded as an instance ofsupervised machine learning, i.e., learning where a training set ofcorrectly-identified observations is available. The correspondingunsupervised procedure is known as clustering (or cluster analysis), andinvolves grouping data into categories based on some measure of inherentsimilarity (e.g. the distance between instances, considered as vectorsin a multi-dimensional vector space). For purposes of the presentapplication, classification is regarded as including clustering.

One illustrative classifier module 16 is an audio classifier, whichcategorizes input stimulus as speech, music, background/indeterminate,or silence. For the first three, the module also classifies the volumeof the audio, as loud, mid-level, or quiet.

Illustrative audio classification technologies are detailed in a latersection.

A simple embodiment activates different content recognition modules, inaccordance with the output of the audio classifier, as follows:

TABLE I Nielsen Nuance Audio Gracenote Speech Watermark FingerprintRecognition Audio Classification Detector Engine Engine Silent Quietbackground Mid-level background X X X Loud background X X X Music X XSpeech X X

That is, if the audio classifier module classifies the sensed audio as“silent” or “quiet background,” all three of the detailed contentrecognition modules are controlled to “off.” If the sensed audio isclassified as music, the system activates the Nielsen audio watermarkdetector, and the Gracenote fingerprint engine, but leaves the Nuancespeech recognition engine off.

If the sensed audio is classified as speech, the audio watermarkdetector is activated, as is the speech recognition engine, but nofingerprint calculations are performed.

If the audio classifier identifies a loud or mid-level acousticbackground, but is unable to further classify its type, the audiowatermark detector, the fingerprint engine, and the speech recognitionengine are all activated.

It will thus be recognized that different combinations of recognitiontechnologies are applied to the input content, based on the type ofcontent indicated by the content classifier.

(The detailed recognition modules are all familiar to artisans. A briefreview follows: Nielsen encodes nearly all of the television broadcastsin the United States with an audio watermark that encodes broadcastsource and time data, to assist Nielsen in identifying programs forrating surveys, etc. Nielsen maintains a database that correlatessource/time data decoded from broadcasts, with program names and otheridentifiers. Such watermark technology is detailed, e.g., in U.S. Pat.Nos. 6,968,564 and 7,006,555. Gracenote uses audio fingerprintingtechnology to enable music recognition. Characteristic feature data isderived from audio by a fingerprint engine, and used to query a databasecontaining reference fingerprint data. If a match is found, associatedsong identification data is returned from the database. Gracenote usesfingerprint technology originally developed by Philips, detailed, e.g.,in patent documents 20060075237 and 20060041753. Nuance offers popularspeech recognition technology. Its SpeechMagic SDK and/orNaturallySpeaking SDK can be incorporated into embodiments of thepresent technology to provide speech recognition capability.)

Second classifier module 18 outputs device state type data, or scenarioidentification data, in accordance with context information. Thiscontext information may include the classification of the audio and/orvisual environment (i.e., by the audio-visual classifier module(s) 16,as shown by the dashed line in FIG. 1), and typically includes otherinformation.

This other context information can include, but is not limited to, timeof day, day of week, location, calendar data, clock alarm status, motionand orientation sensor data, social network information (e.g., fromFacebook), etc.

Consider Table II, which expands the Table I information to includecertain device state types as determined by the second classifier module(i.e., “away from office after work hours” and “at office during workhours”):

TABLE II Nielsen Nuance Audio Gracenote Speech Watermark FingerprintRecognition Device State Type Detector Engine Engine Silent, away fromoffice after work hours Quiet background, away from office after workhours Mid-level background, away X X X from office after work hours Loudbackground, away from X X X office after work hours Loud or quiet music,away X X from office after work hours Loud or quiet speech, away X Xfrom office after work hours Silent, at office during work hours Quietbackground, at office during work hours Mid-level background, at officeduring work hours Loud background, at office X during work hours Loud orquiet music, at office during work hours Loud or quiet speech, at Xoffice during work hours

It will be recognized that the first five rows of Table II are identicalto Table I. They detail how the different modules are controlled whenthe user is away from the office, after work hours, given the notedaudio environments.

The final set of rows is different. These correspond to the device statetype of being at the user's office, during work hours. As can be seen,only the speech recognition engine is ever activated in this context(i.e., when speech or loud background audio is sensed); the othermodules are left idle regardless of the audio environment.

To determine whether the user is “at office during work hours,” or “awayfrom office after work hours,” the second classifier module 18 usesinputs such as time of day data and GPS data, in connection withreference data. This reference data establishes—for the particularsmartphone user—the times of day that should be classified as work hours(e.g., 8 am-5 pm, Monday-Friday), and the location that should beclassified as the office location (e.g., 45.4518° lat, −122.7932° long,+/−0.0012 degrees).

It will be recognized that this arrangement conserves battery power, bynot attempting to recognize songs or television programs while the useris at work. It also aids other tasks the smartphone may be instructed toperform at work, since processing resources are not diverted to the idlerecognition operations.

More typically, the smartphone considers other factors beyond those ofthis simple example. Table IIIA shows a more detailed scenario, asclassified by the second classifier module 18:

TABLE IIIA SENSOR SCENARIO 1 Clock before 6:30am (M-F) GPS homeMicrophone quiet background Ambient light sensor dark Camera (front)dark Camera (back) dark Accelerometer zero movement Alarm set at 6:30amCalendar earliest meeting is at 10:00am Facebook nothing special Close(proximity) spouse

This confluence of circumstances is classed by the second classifiermodule as “Scenario 1.” It corresponds to the scenario in which the useris probably asleep (it is before 6:30 am on a weekday, and the alarm isset for 6:30; the smartphone is stationary in a quiet, darkenvironment). The control rules 20 associated with Scenario 1 cause allof the content recognition modules to be inactive.

The following tables show other scenarios, as classified by the secondclassifier module:

TABLE IIIB SENSOR SCENARIO 2 Clock 6:30am-7:30am (M-F) GPS homeMicrophone mid-level background Ambient light sensor bright Camera(front) dark/bright Camera (back) bright/dark Accelerometer somemovement Alarm dismissed Calendar earliest meeting is at 10:00amFacebook nothing special Close spouse

TABLE IIIC SENSOR SCENARIO 3 Clock 7:30am-8:00am (M-F) GPS commuteMicrophone loud background Ambient light sensor dark/bright Camera(front) dark/bright Camera (back) dark/bright Accelerometer somemovement Alarm dismissed Calendar earliest meeting is at 10:00amFacebook nothing special Close none

TABLE IIID SENSOR SCENARIO 4 Clock 8:00am-10:00am(M-F) GPS officeMicrophone quiet background Ambient light sensor bright Camera (front)bright Camera (back) dark Accelerometer zero movement Alarm dismissedCalendar earliest meeting is at 10:00am Facebook nothing special CloseTomS (workmate); SteveH (workmate); Unknown 1; Unknown2

TABLE IIIE SENSOR SCENARIO 5 Clock 10:00am-10:30am (M-F) GPS meetingroom 1 Microphone mid-level background Ambient light sensor brightCamera (front) bright Camera (back) dark Accelerometer zero movementAlarm dismissed Calendar meeting during 10:00am-10:30am Facebook nothingspecial Close RyanC (workmate); LisaM (workmate); MeganP (workmate)

TABLE IIIF SENSOR SCENARIO 6 Clock 12:00 noon-1:00pm (M-F) GPS SubwayMicrophone loud background Ambient light sensor dark Camera (front) darkCamera (back) dark Accelerometer some movement Alarm dismissed Calendarnothing special Facebook nothing special Close Unknown1; Unknown2;Unknown3; Unknown4

TABLE IIIG SENSOR SCENARIO 7 Clock 8:00pm-11:00pm (F) GPS 22323Colchester Rd, Beaverton Microphone loud background Ambient light sensorbright Camera (front) bright Camera (back) dark Accelerometer zeromovement Alarm nothing special Calendar friend's B-day party 8:00pmFacebook friend's B-day today Close PeterM (buddy); CarrieB (buddy);SheriS (buddy); Unknown1 . . . Unknown 7

TABLE IIIH SENSOR SCENARIO 8 Clock 10:00pm-4:00am GPS road Microphoneany Ambient light sensor dark Camera (front) dark Camera (back) darkAccelerometer/motion >30 miles per hour Alarm nothing special Calendarnothing special Facebook nothing special Close —

Scenario 2 (Table IIIB) corresponds to the user after waking up andbefore leaving home. The rules include instructions appropriate to thisinterval—while the user may be watching a morning news program ontelevision, listening to the radio, or talking with a spouse. Inparticular, the Nielsen watermark detector is active, to allow the userto link to additional web content about something discussed on thetelevision. The fingerprint engine is also active, so that the usermight identify an appealing song that airs on the radio. Speechrecognition may also be enabled, so that the spouse's verbalinstructions to pick up ketchup, grapes, tin foil and postage stamps onthe way home are transcribed for later reference.

The user's smartphone also includes various visual content recognitioncapabilities, including facial recognition. The control rules specifythat, in Scenario 2, facial recognition is disabled—as the user isn'texpected to need prompting to recall faces of anyone encountered at homethis early.

Scenario 3 (Table IIIC) corresponds to the user's drive to work. Notelevision audio is expected in this environment, so the Nielsenwatermark detector is disabled. Song recognition and transcription ofnews from talk radio, however, may be helpful, so the fingerprint andspeech recognition engines are enabled. Again, facial recognition isdisabled.

A different user may take the bus to work, instead of drive a car.Second scenario control rules for this user may be different. Without acar radio, song recognition is unneeded, so the fingerprint engine isdisabled. However, the user sometimes overhears amusing conversations onthe bus, so speech recognition is enabled so that any humorous dialogmay be shared with work-mates. Occasionally, the user sees someone sheshould recognize on the bus—a parent of a child's soccer teammate, forexample—but be unable to recall the name in this different environment.To prepare for this eventuality, the smartphone's facial recognitioncapability is loaded into memory and ready for operation, but does notprocess a frame of camera imagery until signaled by the user. (Thesignal may comprise the user holding the phone in a predetermined poseand saying the word “who.”)

The confluence of sensor information detailed in Table IIID—which thesecond classifier module identifies as Scenario 4—corresponds to thecircumstance of the user's morning work at her desk. The smartphone isapparently lying face-up on a surface in the quiet work environment. Thecorresponding control rules specify that all recognition modules aredisabled. However, if the audio classifier indicates a change in audioenvironment—to mid-level or loud background sound, or speech, the rulescause the phone to enable the speech recognition module. This providesthe user with a transcribed record of any request or information she isgiven, or any instruction she issues, so that it may be referred-tolater.

Speech recognition can raise privacy concerns in some situations,including a work setting. Accordingly, the control rules cause thespeech recognition module to issue an audible “beep” every thirtyseconds when activated at work, to alert others that a recording isbeing made. In contrast, no “beep” alert is issued in thepreviously-discussed scenarios, because no recording of private thirdparty speech is normally expected at home or in the car, and there islikely no expectation of privacy for speech overheard in a bus.

Another datum of context that is processed by the illustrated secondclassifier module 18 is the number and identity of people nearby.“Nearby” may be within the range of a Bluetooth signal issued by aperson's cell phone—typically 30 feet or less. Relative distance withinthis range can be assessed by strength of the Bluetooth signal, with astrong signal indicating, e.g., location within ten feet or less (i.e.,“close”). Identity can be discerned—at least for familiar people—byreference to Bluetooth IDs for their known devices. Bluetooth IDs fordevices owned by the user, family members, workmates, and otheracquaintances, may be stored with the control rules to help discriminatewell known persons from others.

Returning briefly to the previous scenarios, the rules can provide thatspeech recognition—if enabled—is performed without alert beeps, if theuser is apparently solitary (i.e., no strong Bluetooth signals sensed,or only transitory signals—such as from strangers in nearby vehicles),or if the user is in the presence only of family members. However, if anunfamiliar strong Bluetooth signal is sensed when speech recognition isenabled, the system can instruct issuance of periodic alert beeps.

(If the user's phone issues speech recognition alert beeps at home,because the user's child has a new device with an unrecognized Bluetoothidentifier, the user's phone can present a user interface screenallowing the user to store this previously-unrecognized Bluetoothidentifier. This UI allows the user to specify the identifier ascorresponding to a family member, or to associate more particularidentification information with the identifier (e.g., name and/orrelationship). By such arrangement, beeping when not warranted isreadily curtailed, and avoided when such circumstance recurs in thefuture.)

Scenario 5—a work meeting—is contextually similar to Scenario 4, exceptthe audio classifier reports mid-level background audio, and the phone'slocation is in a meeting room. The speech recognition module is enabled,but corporate data retention policies require that transcripts ofmeetings be maintained only on corporate servers, so that they can bedeleted after a retention period (e.g., 12 months) has elapsed. Thecontrol rules module 20 complies with this corporate policy, andimmediately transmits the transcribed speech data to a corporatetranscriptions database for storage—keeping no copy. Alert beeps areissued as a courtesy reminder of the recording. However, since all theclose-by persons are recognized to be “friends” (i.e., their Bluetoothidentifiers correspond to known workmates), the rules cause the phone tobeep only once every five minutes, instead of once every 30 seconds, toreduce the beeps' intrusiveness. (Additionally or alternatively, thevolume of the beeps can be reduced, based on a degree of socialrelationship between the user and the other sensed individual(s)—so thatthe beeps are louder when recording someone who is only distantly or notat all socially related to the user.)

Rules for face recognition in scenario 5 can vary depending on whetherpeople sensed to be close-by are recognized by the user's phone. If allare recognized, the facial recognition module is not activated. However,if one or more close-by persons are not in the user's just-noted“friends” list (or within some more distant degree of relationship in asocial network), then facial recognition is enabled as before—in anon-demand (rather than free-running) mode. (Alternatively, a differentarrangement can be employed, e.g., with facial recognition activated ifone or persons who have a certain type of social network linkage to theuser, or absence thereof, are sensed to be present.)

Scenario 6 finds the user in a subway, during the noon hour. The rulesmay be like those noted above for the bus commute. However, radioreception underground is poor. Accordingly, any facial recognitionoperation consults only facial eigenface reference data stored on thephone—rather than consulting the user's larger collection of Facebook orPicasa facial data, which are stored on cloud servers.

Scenario 7 corresponds to a Friday evening birthday party. Lots ofunfamiliar people are present, so the rules launch the facialrecognition module in free-running mode—providing the user with thenames of every recognized face within the field-of-view of any non-darkcamera. This module relies on the user's Facebook and Picasa facialreference data stored in the cloud, as well as such data maintained inFacebook accounts of the user's Facebook friends. Speech recognition isdisabled. Audio fingerprinting is enabled and—due to the partycontext—the phone has downloaded reference fingerprints for all thesongs on Billboard's primary song lists (Hot 100, Billboard 200, and Hot100 Airplay). Having this reference data cached on the phone allows muchquicker operation of the song recognition application—at least for these200+ songs.

Additional Information

Fingerprint computation, watermark detection, and speech/facialrecognition are computationally relatively expensive (“computationallyheavy”). So are many classification tasks (e.g., speech/musicclassification). It is desirable to prevent such processes from runningat a 100% duty cycle.

One approach is to let the user decide when to run one or more heavymodules—with help from the output of one or more computationally lightdetectors. Adding additional steps to assess the signal quality prior torunning one or more heavy detectors is another approach.

Reducing the duty cycle of a heavy module implies the possibility ofmissed detection, so the user should have some control over how muchcompromise she/he wants.

Consider a simple classifier (e.g., a quietness classifier), whichsimply checks the ambient audio energy within a one-second long audioframe, and compares this value to a pre-defined threshold. Such modulemay indicate that there is a sudden change in the environment from aquiet state. Rules may call for activation of one or more heavyclassifiers to determine whether the new audio environment is music orspeech. In this case, the system may present a display screen with a“Confirm to Proceed” button that the user taps to undertake theclassification. (There can also be an “Ignore” button. The system canhave a default behavior, e.g., “Ignore,” if the user makes no selectionwithin a pre-defined interval, such as ten seconds.)

The user response to such prompts can be logged, and associated withdifferent context information (including the sensitivity of thequietness classifier). Over time, this stored history data can be usedto predict the circumstances in which the user instructs the heavyclassifier to proceed. Action can then be taken based on such historicalprecedent, rather than always resorting to a user tap.

That is, the system can be self-learning, based on user interaction. Forexample, when a quietness classifier detects a change in loudness ofamount “A,” it asks for the user's permission to enable a heavierclassifier (for example, music versus speech classifier) or detector(e.g., watermark detector). If the user agrees, then this “A” level ofloudness change is evidently at least sometimes of interest to the user.However, if over time, it becomes evident that the user uniformlyrefuses to activate the heavy classifier when the loudness changes byamount “A,” then the classifier can reset its threshold accordingly, andnot ask the user for permission to activate the heavy module unless theloudness increases by “B” (where B>A). The quietness classifier thuslearns to be less sensitive.

Conversely, if the user manually launches the heavy module when thequietness classifier has sensed a change in loudness too small totrigger a UI prompt to the user, this indicates that the threshold usedby the quietness classifier is too high, and should be changed to alower level. The quietness classifier thus learns to be more sensitive.

FIG. 3 shows an arrangement using the foregoing principles. A microphoneprovides an ambient audio signal to a simple classifier, which producesan output based on a gross classification (e.g., silence or sound),based on a threshold audio level. If the classifier module switches from“silence” to “sound,” it causes the smartphone to present a userinterface (UI) asking the user whether the system should invoke complexprocessing (e.g., speech recognition, speech/music classification, orother operation indicated by applicable rules). The system then acts inaccordance with the user's instruction.

Shown in dashed lines are additional aspects of the method that may beincluded. For example, the user's response—entered through the UI—islogged and added to a user history, to guide future automated responsesby the system. The current context is also stored in such history, asprovided by a context classifier. In some cases, the user history,alone, may provide instructions as to how to respond in a givensituation—without the need to ask the user.

(It will be recognized that instead of asking the user whether to invokethe complex processing module when the context changes, the system caninstead ask whether the complex processing module should not be invoked.In this case the user's inaction results in the processing module beinginvoked.)

Another approach is to employ an additional classifier, to decidewhether the current audio samples have a quality that merits furtherclassification (i.e., with a heavy classifier). If the quality is judgedto be insufficient, the heavy classifier is not activated (or isde-activated).

Information-bearing signals—such as speech and music—are commonlycharacterized by temporal variation, at least in spectral frequencycontent, and also generally in amplitude, when analyzed over brief timewindows (e.g., 0.5 to 3 seconds). An additional classifier can listenfor audio signals that are relatively uniform in spectral frequencycontent, and/or that are relatively uniform in average amplitude, oversuch a window interval. If such a classifier detects such a signal, andthe amplitude of such signal is stronger by a threshold amount (e.g., 3dB) than a long-term average amplitude of the sensed audio environment(e.g., over a previous interval of 3-30 seconds), the signal may beregarded as interfering noise that unacceptably impairs thesignal-to-noise ratio of the desired audio. In response to such adetermination, the system discontinues heavy module processing until theinterfering signal ceases.

To cite an extreme case, consider a user riding a bus that passes aconstruction site where a loud jack-hammer is being used. Thejust-discussed classifier detects the interval during which thejack-hammer is operated, and interrupts heavy audio processing duringsuch period.

Such classifier may similarly trigger when a loud train passes, or anair compressor operates, or even when a telephone rings—causing thesystem to change from its normal operation in these circumstances.

Another simple classifier relies on principles noted in Lu et al,SpeakerSense: Energy Efficient Unobtrusive Speaker Identification onMobile Phones, Pervasive Computing Conf., 2011. Lu et al use acombination of signal energy (RMS) and zero crossing rate (ZCR) todistinguish human speech from other audio. While Lu et al use theseparameters to identify speech, they can also be used to identifyinformation-bearing signals more generally. (Or, stated otherwise, toflag audio passages that are likely lacking information, so that heavyprocessing modules can be disabled.)

As a further alternative, since the additional classifier works afterthe detection of “sound change,” audio samples prior to the “soundchange” can be used as an approximation of the background noise, and theaudio sample after the “sound change” can be used as the backgroundnoise plus the useful signal. This gives a crude signal-to-noise ratio.The additional classifier can keep heavy modules in an idle state untilthis ratio exceeds a threshold value (e.g., 10 dB).

Still another additional classifier—to indicate the likely absence of aninformation-bearing signal—simply looks at a ratio of frequencycomponents. Generally, the presence of high frequency signal componentsabove a threshold amplitude is an indication of audio information. Aratio of energy in high frequency components (e.g., above 2 KHz)compared to energy in low frequency components (e.g., below 500 Hz) canserve as another simple signal-to-noise ratio. If the classifier findsthat such ratio is below 3 or 10 dB, it can suspend operation of heavymodules.

Such an arrangement is shown in FIG. 4. One or more microphones providesa sensed audio signal to an audio screening classifier 30 (i.e., the“additional” classifier of the foregoing discussion). The microphoneaudio is optionally provided to a speech/music audio classifier 16 (asin FIG. 1) and to several heavy audio detector modules (e.g., watermarkdetector, speech recognition, etc.). The output of the audio screeningclassifier provides enable/disable control signals to the differentheavy detectors. (For simplicity of illustration, the audio screeningclassifier 30 provides the same control signal to all the heavydetectors, but in practical implementation, different controls signalsmay be generated for different detectors.) The control signals from theaudio screening classifier serve to disable the heavy detector(s), basedon the audio sensed by the microphone.

Also shown in FIG. 4 is a context classifier 18, which operates like thesecond classifier module of FIG. 1. It outputs signals indicatingdifferent context scenarios. These output data are provided to a controlrules module 20, which controls the mode of operation of the differentheavy detector based on the identified scenario.

(While the FIG. 4 arrangements shows control of heavy detector modules,heavy classifier modules can be controlled by the same type ofarrangement.)

The above-discussed principles are likewise applicable to sensing visualinformation. Visual image classifiers (e.g., facial recognition systems)generally work on imagery having significant spatial variation inluminance (contrast/intensity) and/or hue (color/chrominance). If framesof imagery appear that are lacking in such variations, any heavy imageprocessing module that would otherwise be operating should suspend itsoperation.

Accordingly, a classifier can look for a series of image framescharacterized by luminance or hue variation below a threshold, andinterrupt heavy visual processing when such scene is detected. Thus, forexample, heavy visual processes are suspended when the user points acamera to a blank wall, or to the floor. (Such action may also be takenbased on smartphone orientation, e.g., with facial recognition onlyoperative when the smartphone is oriented with its camera axis within 20degrees of horizontal. Other threshold values can, of course, be used.)

Similarly, facial recognition analysis is likely wasted effort if theframe is out of focus. Accordingly, a simple classifier can examineframe focus (e.g., by known metrics, such as high frequency content andcontrast measures, or by a camera shake metric—provided by the phone'smotion sensors), and disable facial recognition if the frame is likelyblurred.

Facial recognition can also be disabled if the subject is too distant tolikely allow a correct identification. Thus, for example, if the phone'sautofocus system indicates a focal distance of ten meters or more,facial recognition needn't be engaged.

While Bluetooth is one way to sense other individuals nearby, there areothers.

One technique relies on the smartphone's calendar app. When the user'scalendar, and phone clock, indicate the user is at a meeting, otherparticipants in the user's proximity can be identified from the meetingparticipant data in the calendar app.

Another approach relies on location data, which is short range-broadcastfrom the phone (or published from the phone to a common site), and usedto indicate co-location with other phones. The location data can bederived from known techniques, including GPS, WiFi node identification,etc.

A related approach relies on acoustic emitters that introduce subtle orinaudible background audio signals into an environment, which can beindicative of location. Software in a microphone-equipped device (e.g.,a smartphone app) can listen for such signal (e.g., above or below arange of human hearing, such as above 15-20 KHz), and broadcast orpublish—to a public site—information about the sensed signal. Thepublished information can include information conveyed by the sensedsignal, e.g., identifying the emitting device or its owner, the devicelocation and/or other context, etc.). The published information can alsoinclude information associated with the receiving device (e.g.,identifying the device or its owner, the device location and/or othercontext, etc.). This allows a group of phones near each emitter to beidentified. (Related technology is employed by the Shopkick service, andis detailed in patent publication US20110029370.)

Bluetooth is presently preferred because—in addition to identifyingnearby people, it also provides a communication channel with nearbyphones. This enables the phones to collaborate in various tasks,including speech recognition, music fingerprinting, facial recognition,etc. For example, plural phones can exchange information about theirrespective battery states and/or other on-going processing tasks. Analgorithm is then employed to select one phone to perform a particulartask (e.g., the one with the most battery life remaining is selected toperform watermark decoding or facial recognition). This phone thentransmits the results of its task—or related information basedthereon—to the other phones (by Bluetooth or otherwise).

Another form of collaboration is 3D image modeling, based on camera datafrom two or more different phones, each with a different view of asubject. A particular application is facial recognition, where two ormore different views of a person allow a 3D facial model to begenerated. Facial recognition can then be based on the 3D modelinformation—yielding a more certain identification than 2D facialrecognition affords.

Yet another form of collaboration is for multiple smartphones toundertake the same task, and then share results. Different phoneprocesses may yield results with different confidence measures, in whichcase the result with the highest confidence measure can be used by allphones. (Such processing can be done by processes in the cloud, insteadof using the phones' own processors.)

In some applications, a phone processes ambient audio/visual stimulus inconnection with phone-specific information, allowing different phones toprovide different results. For example, the face of an unknown personmay be identified in a Facebook account accessible to one phone, but notto others. Thus, one phone may be able to complete a task that otherscannot. (Other phone-specific information includes history, contacts,computing context, user context, physical context, etc. See, e.g.,published application 20110161076 and copending application Ser. No.13/174,258, filed Jun. 30, 2011 (now U.S. Pat. No. 8,831,279). For imageprocessing, different phones may have better or worse views of thesubject.)

Relatedly, collaborating phones can send the audio/imagery they capturedto one or more other phones for processing. For example, a phone havingFacebook access to useful facial recognition data may not be the phonewith the best view of a person to be identified. If plural phones eachcaptures data, and shares such data (or information based thereon, e.g.,eigenface data) to the other phones, results may be achieved that arebetter than any phone—by itself—could manage.

Of course, devices may communicate other than by Bluetooth. NFC and WiFiare two such alternatives.

Bluetooth was also noted as a technique for determining that a user isin a vehicle. Again, other arrangements can be employed.

One is GPS. Even a sporadically-executing GPS module (e.g., once everyminute) can collect enough trajectory information to determine whether auser is moving in a manner consistent with vehicular travel. Forexample, GPS can establish that the user is following established roads,and is moving at speeds above that associated with walking or biking.(When disambiguating biking from motorized vehicle travel, terrainelevation can be considered. If the terrain is generally flat, or if thetraveler is going uphill, a sustained speed of more than 20 mph maydistinguish motorized transport from bicycling. However, if the user isfollowing a road down a steep downhill incline, then a sustained speedof more than 35 mph may be used to establish motorized travel withcertainty.)

If two or more phones report, e.g., by a shared short-range contextbroadcast, that they are each following the same geo-location-track, atthe same speed, then the users of the two phones can conclude that theyare traveling on the same conveyance—whether car, bus, bike, etc.

Such conclusion can similarly be made without GPS, e.g., if two or morephones report similar data from their 3D accelerometers, gyroscopes,and/or magnetometers Still further, co-conveyance of multiple users canlikewise be established if two or more phones capture the same audio(e.g., as indicated by a correlation metric exceeding a threshold value,e.g., 0.9), and share this information with other nearby devices.

Again, the cloud can serve as a recipient for such information reportedby the smartphones, can make determinations, e.g., about correlationbetween devices.

Reference was made to a short-range context broadcast. This can beeffected by phones broadcasting their sensed context information (whichmay include captured audio) by Bluetooth to nearby devices. Theinformation shared may be of such a character (e.g., acceleration,captured audio) that privacy concerns do not arise—given the short rangeof transmission involved.

While this specification focuses on audio applications, and alsoconsiders facial recognition, there are unlimited classes that might berecognized and acted-on. A few other visual classes include opticalcharacter recognition (OCR) and barcode decoding.

The presence of multiple cameras on a smartphone enables otherarrangements. For example, as noted in application Ser. No. 13/212,119,filed Aug. 17, 2011 (now U.S. Pat. No. 8,564,684), a user-facing cameracan be used to assess emotions of a user (or user response toinformation presented on the smartphone screen), and tailor operation ofthe phone—including use of the other camera—accordingly.

A user-facing camera can also detect the user's eye position. Operationof the phone can thereby be controlled. For example, instead ofswitching between “portrait” and “landscape” display modes based on thephone's position sensors, this screen display mode can be controlledbased on the orientation of the user's eyes. Thus, if the user is lyingin bed on her side (i.e., with a line between the pupils extendingvertically), and the phone is spatially oriented in a landscapedirection (with its long axis extending horizontally, parallel to theaxis of the user's body), the phone can operate its display in the“portrait” mode. If the user turns the phone ninety degrees (i.e., sothat its long axis is parallel to the axis between the users' eyes), thephone switches its display mode to “landscape.”

Similarly, if the user is lying on her back, and holding the phoneoverhead, the screen mode switches to follow the relative orientation ofthe axis between the user's eyes, relative to the screen axis. (That is,if the long axis of the phone is parallel with the axis between theuser's eyes, landscape mode is used; and vice versa.)

If the phone is equipped with stereo cameras (i.e., two cameras withfields of view that overlap), the two views can be used for distancedetermination to any point in the frame (i.e., range finding). Forcertain visual detection tasks (e.g., watermark and barcode decoding),the distance information can be used by the phone processor to guide theuser to move the phone closer to, or further from, the intended subjectin order to achieve best results.

A phone may seek to identify an audio scene by reference to sensedaudio. For example, a meeting room scene may be acousticallycharacterized by a quiet background, with distinguishable human speech,and with occasional sound source transition (different people speakingalternatively). A home scene with the user and her husband may beacoustically characterized by a mid-level background audio (perhapsmusic or television), and by two different voices speaking alternately.A crowded convention center may be characterized by a high-levelbackground sound, with many indistinguishable human voices, andoccasionally the user's voice or another.

Once an audio scene has been identified, two or more smartphones can actand cooperate in different ways. For example, if the scene has beenidentified as a meeting, the user's phone can automatically check-in forthe room, indicating that the meeting room is occupied. (Calendarprograms are often used for this, but impromptu meetings may occupyrooms without advance scheduling. The smartphone can enter the meetingon the calendar—booking the room against competing reservations—afterthe meeting has started.)

The phone may communicate with a laptop or other device controlling aPowerpoint slide presentation, to learn the number of slides in the deckbeing reviewed, and the slide currently being displayed. The laptop orthe phone can compute how quickly the slides are being advanced, andextrapolate when the meeting will conclude. (E.g., if a deck has 30slides, and it has taken 20 minutes to get through 15 slides, aprocessor can figure it will take a further 20 minutes to get throughthe final 15 slides. Adding 10 minutes at the end for a wrap-updiscussion, it can figure that the meeting will conclude in 30 minutes.)This information can be shared with participants, or posted to thecalendar app to indicate when the room might become available.

If the auditory scene indicates a home setting in the presence of aspouse, the two phones can exchange domestic information (e.g., shoppinglist information, social calendar data, bills to be paid soon, etc.).

In a crowded convention center scene, a phone can initiate automaticelectronic business card exchange (e.g., v-card), if it senses the userhaving a chat with another person, and the phone does not already havecontact information for the other person (e.g., as identified byBluetooth-indicated cell phone number, or otherwise).

In the convention scene, the user's phone might also check the publiccalendars of people with whom the user talks, to identify those withsimilar transportation requirements (e.g., a person whose flight departsfrom the same airport as the user's departing flight, with a flight timewithin 30 minutes of the user's flight). Such information can then bebrought to the attention of the user, e.g., with an audible or tactilealert.

Reference was made to performing certain operations in the cloud. Taskscan be referred to the cloud based on various factors. An example is usecloud processing for “easy to transmit” data (i.e., small size) and“hard to calculate” tasks (i.e., computationally complex). Cloudprocessing is often best suited for tasks that don't require extensivelocal knowledge (e.g., device history and other information stored onthe device).

Consider a traveler flying to San Francisco for a conference, who needsto commute to a conference center hotel downtown. On landing at theairport, the user's phone sends the address of the downtownhotel/conference center to a cloud server. The cloud server hasknowledge of real-time traffic information, construction delays, etc.The server calculates the optimal route under various constraints, e.g.,shortest-time route, shortest-distance route, most cost-effective route,etc. If the user arrives at the airport only 20 minutes before theconference begins, the phone suggests taking a taxi (perhaps suggestingsharing a taxi with others that it senses have the samedestination—perhaps others who also have a third-party trustworthinessscore exceeding “good”). In contrast, if the user arrives a day ahead ofthe conference, the phone suggests taking BART—provided the usertraveled with one piece of checked baggage or less (determined byreference to airline check-in data stored on the smartphone). Such routeselection task is an example of “little data, big computation.”

In addition to audio and imagery from its own sensors, the smartphonecan rely on audio and imagery collected by public sensors, such assurveillance cameras in a parking garage, mall, convention center, or ahome security system. This information can be part of the “bigcomputation” provided by cloud processing. Or the data can be processedexclusively by the smartphone, such as helping the user find where sheparked her yellow Nissan Leaf automobile in a crowded parking lot.

While the specification has focused on analysis of audio and image data,the same principles can be applied to other data types. One is hapticdata. Another is gas and chemical analysis. Related is olfactoryinformation. (Smell sensors can be used by smartphones as a diagnosticaid in medicine, e.g., detecting biomarkers that correlate to lungcancer in a user's breath.)

Naturally, information from the user's social networking accounts(Facebook, Twitter, Foursquare, Shopkick, LinkedIn, etc.) can be used asinput to the arrangements detailed herein (e.g., as contextinformation). Likewise with public information from the accounts ofpeople that the user encounters, e.g., at work, home, conferences, etc.Moreover, information output from the detailed arrangements can beposted automatically to the user's social networking account(s).

It will be recognized that facial recognition has a number of uses. One,noted above, is as a memory aid—prompting the user with a name of anacquaintance. Another is for user identification and/or authorization.For example, the user's smartphone may broadcast certain privateinformation only if it recognizes a nearby person as a friend (e.g., byreference to the user's list of Friends on Facebook). Facial recognitioncan also be used to tag images of a person with the person's name andother information.

In some embodiments a user's smartphone broadcasts one or more highquality facial portraits of the user, or associated eigenface data.Another smartphone user can snap a poor picture of the user. Thatsmartphone compares the snapped image with high quality image data (oreigenface data) received over Bluetooth from the user, and can confirmthat the poor picture and the received image data correspond to the sameindividual. The other smartphone then uses the received image data inlieu of the poor picture, e.g., for facial recognition, or to illustratea Contacts list, or for any other purpose where the user's photo mightbe employed.

FIG. 5 shows an event controller table for another audio embodiment,indicating how two digital watermark decoders (one tailored forwatermarks commonly found in music, another tailored for watermarkscommonly found in broadcast speech) are controlled, based on classifierdata categorizing input audio as likely silence, speech, and/or music.FIG. 6 shows a corresponding flow chart.

FIG. 7 shows an event controller table for another embodiment—this oneinvolving imagery. This arrangement shows how different recognitionmodules (1D barcode, 2D barcode, image watermark, image fingerprint, andOCR) are controlled in accordance with different sensor information.(Sensors can encompass logical sensors, such as classifiers.) In theillustrated arrangements, the system includes a light sensor, and amotion sensor. Additionally, one or more image classifiers outputsinformation identifying the imagery as likely depicting text, a 1Dbarcode, or a 2D barcode.

Note that that there is no classifier output for “image.” Everything isa candidate. Thus, the image watermark decoding module, and the imagefingerprint module, are activated based on certain combinations ofoutputs from the classifier(s) (e.g., when none or all of the threetypes of classified images is identified).

Note, too, how no image recognition processing is undertaken when thesystem detects a dark scene, or the system detects that the imagery wascaptured under conditions of motion (“jerk”) that make image qualitydubious.

FIG. 8 shows a corresponding flow chart.

Published application 20120208592 further details technology useful withthe arrangements of FIGS. 5-8.

More on Audio Classification

Audio classification problem is often termed as content-basedclassification/retrieval, or audio segmentation. There are two basicissues in this work: feature selection and classifier selection.

One of the early works in this field was published in 1996 by Wold etal. [5]. He used various perceptual features (loudness, pitch,brightness, bandwidth and harmonicity) and the nearest neighborclassifier. In [6], Foote used the 13 Mel-Frequency CepstralCoefficients (MFCCs) as audio features, and a vector quantization methodfor classification. In [7], Zhang and Kuo used hidden Markov models tocharacterize audio segments, and a hierarchical classifier is used fortwo-step classification. Scheirer, in [12], evaluated the properties of13 features for classify speech and music, achieving very high accuracy(around 95% accuracy, but only for music/speech classification),especially integrating long segments of sound (2.4 seconds). Liu et al.[8] argued that “audio understanding can be based on features in threelayers: low-level acoustic characteristics, intermediate-level audiosignatures associated with different sounding objects, and high levelsemantic models of audio in different scene classes”; and“classification based on these low-level features alone may not beaccurate, but the error can be addressed in a higher layer by examiningthe structure underlying a sequence of continuous audio clips.”

Meanwhile, in terms of calculating low-level features, [6,8] mentionedexplicitly to firstly divide the audio samples into 1-second long clipsand then further divide each clip into 40 non-overlapping 25-milisecondlong sub-clips. The low-level features are calculated on each25-millisecond long sub-clip and then merged through the 40 sub-clips torepresent the 1-second long clip. The classification is based on the1-second long clips. (In a 25-milisecond period, the sound signal showsa stationary property, whereas in a 1-second period, the sound signalexhibits characteristics corresponding to the categories that we want todistinguish. In these early references, and also in later years, thesecategories include silence, music, speech, environment sound, speechwith environment sound, etc.

In the 2000s, Microsoft Research Asia worked actively on audioclassification, as shown in [9,10]. Lu in [9] used low-level audiofeatures, including 8 order MFCCs and several other perceptual features,as well as kernel SVM (support vector machine) as the classifier in acascaded scheme. The work in [10] also included perceptual features andused different classifiers in a cascaded classification scheme,including k-NN, LSP VQ and rule based methods (for smoothing). In thispaper they used dynamic feature sets (use different features) forclassifying different classes.

More recently, work on audio classification has increased. Some peoplework on exploiting new audio features, like [2, 3, 4, 17], or newclassifiers [13]. Others work on high level classification frameworkbeyond the low level features, like [1,18]. Still others work on theapplications based on audio classification, for example, determinationof emotional content of video clips [16].

Other researchers are comparing existing feature extraction methods,classifier, and parameter selection schemes, making audio classificationimplementation practical, and even have prototype implemented on a Nokiacellphone [14,15].

Arrangements particularly focused on speech/music discrimination include[19] and [20].

REFERENCES

-   1. Rui Cai, Lie Lu, Alan Hanjalic, Hong-Jiang Zhang, and Lian-Hong    Cai, “A flexible framework for key audio effects detection and    auditory context inference,” IEEE Transactions on audio, speech, and    language processing, vol. 14, no. 13, May 2006. (MSRA group)-   2. Jalil Shirazi, and Shahrokh Ghaemmaghami, “Improvement to    speech-music discrimination using sinusoidal model based features,”    Multimed Tools Appl, vol. 50, pp. 415-435, 2010. (Islamic Azad    University, Iran; and Sharif University of Technology, Iran)-   3. Zhong-Hua Fu, Jhing-Fa Wang and Lei Xie, “Noise robust features    for speech-music discrimination in real-time telecommunication,”    Multimedia and Expo, 2009 IEEE International Conference on (ICME    2009), pp. 574-577, 2009. (Northwestern Polytech Univ., China; and    National Cheng Kung University, Taiwan)-   4. Ebru Dogan, et al., “Content-based classification and    segmentation of mixed-type audio by using MPEG-7 features,” 2009    First International Conference on Advances in Multimedia, 2009.    (ASELSAN Electronics Industries Inc.; and Baskent Univ.; and Middle    East Technical Univ., Turkey)-   5. Erling Wold, Thom Blum, Douglas Keislar, and James Wheaton,    “Content-based classification, search and retrieval of audio,” IEEE    Multimedia Magazine, vol. 3, no. 3, pp. 27-36, 1996. (Muscle Fish)-   6. Jonathan Foote, “Content-based retrieval of music and audio,”    Multimedia storage and archiving systems II, Proc. Of SPIE, vol.    3229, pp. 138-147, 1997. (National University of Singapore)-   7. Tong Zhang and C.-C. J. Kuo, “Audio-guided audiovisual data    segmentation, indexing, and retrieval,” In Proc. Of SPIE storage and    retrieval for Image and Video Databases VII, 1999. (Integrated Media    System Center, USC)-   8. Zhu Liu, Yao Wang and Tsuhan Chen, “Audio feature extraction and    analysis for scene segmentation and classification,” Journal of VLSI    Signal Processing Systems, pp. 61-79, 1998. (Polytechnic University)-   9. Lie Lu, Stan Z. Li and Hong-Jiang Zhang, “Content-based audio    segmentation using support vector machines,” ICME 2001. (MSRA)-   10. Lie Lu, Hao Jiang and Hongjiang Zhang, “A robust audio    classification and segmentation method,” ACM Multimedia, 2001.    (MSRA)-   11. Lie Lu and Alan Hanjalic, “Text-like segmentation of general    audio for content-based retrieval,” IEEE Transactions on Multimedia,    vol. 11, no. 4, June 2009.-   12. Eric Scheirer and Malcolm Slaney, “Construction and evaluation    of a robust multifeature speech/music discriminator,” ICASSP 1997.    (MIT Media Lab)-   13. Dong-Chul Park, “Classification of audio signals using Fuzzy    c-means with divergence-based kernel,” Pattern Recognition Letters,    vol. 30, issue 9, 2009. (Myong Ji University, Republic of Korea)-   14. Mikko Perttunen, Max Van Kleek, Ora Lassila, and Jukka Riekki,    “Auditory context recognition using SVMs,” The second International    Conference on Mobile Ubiquitous Computing, Systems, Services and    Technologies (Ubicomm 2008), 2008. (University of Oulu, Finland;    CSAIL, MIT; Nokia Research Center Cambridge, Mass.)-   15. Mikko Perttunen, Max Van Kleek, Ora Lassila, and Jukka Riekki,    “An implementation of auditory context recognition for mobile    devices,” Tenth International Conference on Mobile Data Management:    Systems, Services and Middleware, 2009. (University of Oulu,    Finland; CSAIL, MIT; Nokia Research Center Cambridge, Mass.)-   16. Rene Teixeira, Toshihiko Yamasaki, and Kiyoharu Aizawa,    “Determination of emotional content of video clips by low-level    audiovisual features,” Multimedia Tools and Applications, pp. 1-29,    January 201. (University of Tokyo)-   17. Lei Xie, Zhong-Hua Fu, Wei Feng, and Yong Luo,    “Pitch-density-based features and an SVM binary tree approach for    multi-class audio classification in broadcast news,” Multimedia    Systems, vol. 17, pp. 101-112, 2011. (Northwestern Polytechnic    University, China)-   18. Lie Lu, and Alan Hanjalic, “Text-like segmentation of general    audio for content-based retrieval,” IEEE Transactions on Multimedia,    vol. 11, no. 4, pp. 658-699, 2009. (MSRA;

Delft University of Technology, Netherlands)

-   19. Chen et al, Mixed Type Audio Classification with Support Vector    Machine, 2006 IEEE Int'l Conf on Multimedia and Expo, pp. 781-784.-   20. Harb et al, Robust Speech Music Discrimination Using Spectrum's    First Order Statistics and Neural Networks, 7^(th) Intl Symp. on    Signal Proc. and its Applications, 2003.

Exemplary classifiers also include those detailed in patent publications20020080286 (British Telecomm), 20020080286 (NEC), 20020080286(Philips), 20030009325 (Deutsche Telekom), 20040210436 (Microsoft),20100257129 and 20120109643 (Google), and U.S. Pat. No. 5,712,953(Hewlett-Packard).

Other Remarks

Having described and illustrated the principles of our inventive workwith reference to illustrative examples, it will be recognized that thetechnology is not so limited.

For example, while reference has been made to smartphones, it will berecognized that this technology finds utility with all manner ofdevices—both portable and fixed. PDAs, organizers, portable musicplayers, desktop computers, laptop computers, tablet computers,netbooks, wearable computers, servers, etc., can all make use of theprinciples detailed herein.

Similarly, it is expected that head-worn devices (e.g., Google Glassgoggles), and other unobtrusive sensor platforms will eventually replacetoday's smartphones. Naturally, the present technology can be used withsuch other forms of devices.

The term “smartphone” should be construed to encompass all such devices,even those that are not strictly-speaking cellular, nor telephones.

(Details of the iPhone, including its touch interface, are provided inApple's published patent application 20080174570.)

The design of smartphones and other computers used in embodiments of thepresent technology is familiar to the artisan. In general terms, eachincludes one or more processors, one or more memories (e.g. RAM),storage (e.g., a disk or flash memory), a user interface (which mayinclude, e.g., a keypad, a TFT LCD or OLED display screen, touch orother gesture sensors, a camera or other optical sensor, a compasssensor, a 3D magnetometer, a 3-axis accelerometer, a microphone, etc.,together with software instructions for providing a graphical userinterface), interconnections between these elements (e.g., buses), andan interface for communicating with other devices (which may bewireless, such as GSM, CDMA, W-CDMA, CDMA2000, TDMA, EV-DO, HSDPA, WiFi,WiMax, or Bluetooth, and/or wired, such as through an Ethernet localarea network, a T-1 internet connection, etc.).

While this specification earlier noted its relation to the assignee'sprevious patent filings, it bears repeating. These disclosures should beread in concert and construed as a whole. Applicants intend thatfeatures in each be combined with features in the others. That is, itshould be understood that the methods, elements and concepts disclosedin the present application be combined with the methods, elements andconcepts detailed in those related applications. While some have beenparticularly detailed in the present specification, many have not—due tothe large number of permutations and combinations is large. However,implementation of all such combinations is straightforward to theartisan from the provided teachings.

The processes and system components detailed in this specification maybe implemented as instructions for computing devices, including generalpurpose processor instructions for a variety of programmable processors,including microprocessors, graphics processing units (GPUs, such as thenVidia Tegra APX 2600), digital signal processors (e.g., the TexasInstruments TMS320 series devices), etc. These instructions may beimplemented as software, firmware, etc. These instructions can also beimplemented to various forms of processor circuitry, includingprogrammable logic devices, FPGAs (e.g., the noted Xilinx Virtex seriesdevices), FPOAs (e.g., the noted PicoChip devices), and applicationspecific circuits—including digital, analog and mixed analog/digitalcircuitry. Execution of the instructions can be distributed amongprocessors and/or made parallel across processors within a device oracross a network of devices. Transformation of content signal data mayalso be distributed among different processor and memory devices.References to “processors” or “modules” should be understood to refer tofunctionality, rather than requiring a particular form of hardwareand/or software implementation.

Software instructions for implementing the detailed functionality can bereadily authored by artisans, from the descriptions provided herein,e.g., written in C, C++, Visual Basic, Java, Python, Tcl, Perl, Scheme,Ruby, etc. Smartphones and other devices according to certainimplementations of the present technology can include software modulesfor performing the different functions and acts. Known artificialintelligence systems and techniques can be employed to make theinferences, conclusions, and other determinations noted above.

Commonly, each device includes operating system software that providesinterfaces to hardware resources and general purpose functions, and alsoincludes application software which can be selectively invoked toperform particular tasks desired by a user. Known browser software,communications software, and media processing software can be adaptedfor many of the uses detailed herein. Software and hardwareconfiguration data/instructions are commonly stored as instructions inone or more data structures conveyed by tangible media, such as magneticor optical discs, memory cards, ROM, etc., which may be accessed acrossa network. Some embodiments may be implemented as embedded systems—aspecial purpose computer system in which the operating system softwareand the application software is indistinguishable to the user (e.g., asis commonly the case in basic cell phones). The functionality detailedin this specification can be implemented in operating system software,application software and/or as embedded system software.

While this disclosure has detailed particular ordering of acts andparticular combinations of elements in the illustrative embodiments, itwill be recognized that other contemplated methods may re-order acts(possibly omitting some and adding others), and other contemplatedcombinations may omit some elements, add others, and configure theelements differently, etc.

Although disclosed as a complete system, sub-combinations of thedetailed arrangements are also separately contemplated.

While detailed primarily in the context of systems that perform audiocapture and processing, corresponding arrangements are equallyapplicable to systems that capture and process visual stimulus(imagery), or that capture and process both imagery and audio.

Similarly, while certain aspects of the technology have been describedby reference to illustrative methods, it will be recognized thatapparatus configured to perform the acts of such methods are alsocontemplated as part of applicant's inventive work. Likewise, otheraspects have been described by reference to illustrative apparatus, andthe methodology performed by such apparatus is likewise within the scopeof the present technology. Still further, tangible computer readablemedia containing instructions for configuring a processor or otherprogrammable system to perform such methods is also expresslycontemplated.

The reference to Bluetooth technology to indicate proximity to, andidentity of, nearby persons is illustrative only. Many alternativetechnologies are known to perform one or both of these functions, andcan be readily substituted.

The illustrations should be understood as exemplary and not limiting.

It is impossible to expressly catalog the myriad variations andcombinations of the technology described herein. Applicants recognizeand intend that the concepts of this specification can be combined,substituted and interchanged—both among and between themselves, as wellas with those known from the cited prior art. Moreover, it will berecognized that the detailed technology can be included with othertechnologies—current and upcoming—to advantageous effect.

The reader is presumed to be familiar with the documents (includingpatent documents) referenced herein. To provide a comprehensivedisclosure without unduly lengthening this specification, applicantsincorporate-by-reference these documents referenced above. (Suchdocuments are incorporated in their entireties, even if cited above inconnection with specific of their teachings.) These references disclosetechnologies and teachings that can be incorporated into thearrangements detailed herein, and into which the technologies andteachings detailed herein can be incorporated.

1-16. (canceled)
 17. A portable user device comprising a processor, amemory and plural sensors, including at least a microphone or camera,the memory containing software instructions configuring the device toperform acts including: (a) applying a classification procedure toreceived audio and/or visual information, sensed by the microphoneand/or camera, to determine its type; (b) determining a scenario type,based at least in part on one or more of time of day, day of week,location, calendar data, clock alarm status, motion sensor data,orientation sensor data, and information from a social networkingservice; and (c) based on a combination of (i) the determined type ofthe received audio and/or visual information, and (ii) the determinedtype of scenario, applying a corresponding group of one or morerecognition technologies to the received audio and/or visualinformation; wherein the device is further configured by said softwareinstructions to apply three or more different groups of recognitiontechnologies to the received audio and/or visual information, inaccordance with which of three or more different combinations of (i)information type, and (ii) scenario type, are respectively determined.18. A method performed by a user's battery-powered portable device,configured by software instructions, the method comprising the acts:receiving first visual information; determining a first scenario type,based at least in part on one or more of context factors from the listconsisting of: time of day, day of week, location, user calendar data,user clock alarm status, motion sensor data, orientation sensor data,and information from a social networking service; identifying a firstrecognition agent based at least in part on the first scenario type, andlaunching the identified first recognition agent to process the firstvisual information; receiving second visual information; determining asecond scenario type, based at least in part on one or more of contextfactors from said list; and identifying a second recognition agent basedat least in part on the second scenario type, and launching theidentified second recognition agent to process the second visualinformation; wherein the first and second visual information aredifferent, the first and second scenario types are different, and thefirst and second recognition agents are different, wherein the deviceseems to respond intuitively by activating different recognition agentsbased on different device contexts.
 19. The method of claim 18 thatincludes capturing the first and second visual information using acamera of said battery-powered portable device.
 20. The method of claim18 that further includes applying a classification procedure to thereceived first visual information to identify its type, and identifyingthe first recognition agent based on both the identified type of thereceived first information, and on said first scenario type.